Mens Firewall Pants From Rab Fabric: Pertex Shield+ 3L with stretch (100% nylon, 40D, 115g/m²) YKK AquaGuard 3-way side zips Dual internal storm flap system Part elasticated, gripper waistband with drawcord Knee articulation Under-boot cord attachment loops Tethered hem drawcord Reflective trim Regular fit Weight: 319gThe Men's Firewall Pants use waterproof and breathable three-layer Pertex Shield+ fabric with stretch for use in alpine or winter conditions where freedom of movement is essential. Three-quarter-length, YKK AquaGuard three-way side zips provide excellent ventilation, lending the pants to active use in mixed environments. Comfort is enhanced with the addition of a part-elasticated waistband. Knee articulation assists you with technical climbing.The pants are compatible with winter boots thanks to the addition of under-boot attachment loops. A regular fit allows for a baselayer to be comfortably worn underneath.